Synonyms of mercurial in English:

mercurial


See US English definition of mercurial

See UK English definition of mercurial

See Spanish definition of voluble

adjective

1‘a mercurial temperament’

SYNONYMS
volatile, capricious, temperamental, excitable, fickle, changeable, unpredictable, variable, protean, mutable, erratic, quicksilver, inconstant, inconsistent, unstable, unsteady, fluctuating, ever-changing, kaleidoscopic, fluid, wavering, vacillating, moody, flighty, wayward, whimsical, giddy, impulsive
technical labile
ANTONYMS

stable, steady, constant